Search for Baryon and Lepton Number Violation in $J/\psi\to\Lambda_c^+e^-+c.c.$

TL;DR

This study searches for baryon and lepton number violation in $J/ar{J}$ decays to $ ext{Lambda}_c^+ e^-$, setting a new upper limit on the branching fraction due to no observed signal.

Contribution

First experimental search for $J/ o ext{Lambda}_c^+ e^-$ decay, establishing the most stringent upper limit on its branching fraction.

Findings

No signal observed for the decay process.

Upper limit on branching fraction set at $6.9 imes 10^{-8}$.

Provides constraints on baryon and lepton number violation models.

Abstract

Using $1.31\times10^9$ $J/\psi$ events collected by the BESIII detector at the Beijing Electron Positron Collider, we search for the process $J/\psi\to\Lambda_c^+e^-+c.c.$ for the first time. In this process, both baryon and lepton number conservation is violated. No signal is found and the upper limit on the branching fraction $\mathcal{B}(J/\psi\to\Lambda_c^+e^-+c.c.)$ is set to be $6.9\times10^{-8}$ at the 90\% Confidence Level.